Study on the hot deformation behaviors of B50A789G blade steel
The isothermal hot compression test of B50A789G blade steel was conducted by Gleeble-3800 thermo-mechanical simulator in the strain rate range of 0.01-10 s-1 and the deformation temperat-ure range of 950-1 200 ℃.Based on Arrhenius hyperbolic sine equation,the constitutive equation was established.The hot processing map was constructed based on dynamic material model(DMM).The hot working window was determined on the basis of hot processing map and deformed microstruc-tures.The results show that the optimum domain for hot forming of B50A789G blade steel is determ-ined in the temperature ranges of 1 000-1 050 ℃with strain rates of 0.01-10 s-1 and 1 150-1 200 ℃ with strain rates of 1-10 s-1,respectively.It is found that complete dynamic recrystallization occurs in this do-main.In addition,the grain size distribution of original austenite is uniform and fine,which is condu-cive to the homogenization and refinement of the material microstructures.This study provides support for the industrial application of B50A789G blade steel.
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